Are the Effects of Use and Disuse Inherited?: An Examination of the View Held by Spencer and DarwinMacmillan, 1890 - 156 páginas |
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Página 8
... existence is questioned . After allowing for lost teeth and the conse- quent alveolar absorption , and for a reduction proportional to that shown in the rest of the skull , the difference in average weight in fifty European and fourteen ...
... existence is questioned . After allowing for lost teeth and the conse- quent alveolar absorption , and for a reduction proportional to that shown in the rest of the skull , the difference in average weight in fifty European and fourteen ...
Página 30
... existence . Nature favours and develops enjoyments to a certain extent , for they subserve self - preservation and sexual and social preference in innumerable ways . But modern æsthetic ad- vance seems to be almost entirely due to the ...
... existence . Nature favours and develops enjoyments to a certain extent , for they subserve self - preservation and sexual and social preference in innumerable ways . But modern æsthetic ad- vance seems to be almost entirely due to the ...
Página 32
... superiority of geniuses proves use- inheritance , why should not the inferiority of the sons of geniuses prove the existence of a tendency which is the exact opposite of use- inheritance ? 32 ARE THE EFFECTS OF USE INHERITED ?
... superiority of geniuses proves use- inheritance , why should not the inferiority of the sons of geniuses prove the existence of a tendency which is the exact opposite of use- inheritance ? 32 ARE THE EFFECTS OF USE INHERITED ?
Página 34
... must be its practical inefficacy , arising probably from its weakness , its obscurity and uncertainty or its non - existence . INHERITED EPILEPSY IN GUINEA - PIGS . Brown - Séquard's 34 ARE THE EFFECTS OF USE INHERITED ?
... must be its practical inefficacy , arising probably from its weakness , its obscurity and uncertainty or its non - existence . INHERITED EPILEPSY IN GUINEA - PIGS . Brown - Séquard's 34 ARE THE EFFECTS OF USE INHERITED ?
Página 95
... existence of the minor factor , inasmuch as slight changes in each generation need not necessarily be matters of life and death to the individual , although their cumulative development by use- inheritance might eventually become of ...
... existence of the minor factor , inasmuch as slight changes in each generation need not necessarily be matters of life and death to the individual , although their cumulative development by use- inheritance might eventually become of ...
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Términos y frases comunes
acquired characters acquired modifications alleged Animals and Plants appears artificial selection atavism attributed Aylesbury duck become birds bones breeds cause cent civilization concomitant variation Contemporary Review Crown 8vo cumulative Darwin Descent deterioration diminished diminution diseases domestic animals domestic rabbit duck effects of ancestral effects of disuse enlarged epilepsy evidence evil explanation eyes fact factor of evolution fancy pigeons father favoured Francis Darwin Francis Galton Galton gemmules guinea-pigs heredity Illustrations improvement incisors increased individual inherited effects inherited injuries inherited mutilations insects instances instincts jaws Lamarckian leg-bones legs lengthened muscles natural or artificial natural selection nervous neuter offspring organs Origin of Species pangenesis panmixia parents pigeons Plants under Domestication quasi-inheritance race Ray Lankester reduced wings relative reproductive elements sexual selection shortened Spencer spite of disuse spontaneous variations sternum structure suppose tameness teeth tend tendency theory thickened sole tion toes transmit true inheritance use-inheritance Variation of Animals weight Weismann wing-bones
Pasajes populares
Página 26 - For peculiar habits confined to the workers or sterile females, however long they might be followed, could not possibly affect the males and fertile females, which alone leave descendants. I am surprised that no one has hitherto advanced this demonstrative case of neuter insects, against the well-known doctrine of inherited habit, as advanced by Lamarck.